Well, I have no idea what is wrong with my 94 yet, but all I know is that I heard a pretty good crack of a sound driving down the highway a couple miles from home. Drive it on home and pull up to the house and I have smoke coming from under the hood. Turned it off and it smells like coolant and I can hear dripping at the back of the engine. Do failed headgaskets make a crack/loud popping noise when they go? Maybe a stupid question. It did not overheat and the temp. gauge didn't even climb. No white tailpipe smoke. Maybe I just lost a hose? There is coolant on the back of the engine and front of the trans. Not tons, but a pretty good soaking. Am going to check hoses when it all cools down and I can actually touch things back there.